What is an alpha video?

Excuse me, could you please elaborate on what an "alpha video" refers to in the context of cryptocurrency or finance? Is it a type of promotional material showcasing an upcoming project or service? Is it a video tutorial for beginners in the field? Or does it have a more technical meaning, perhaps related to the development of blockchain technology or the analysis of market trends? I'm quite intrigued by this term and would appreciate your clarification.